Acid-proof cementing compositions and process of preparing the same



. COMPOSH IUNS,

' COATING R PLASTIC.

Patented Dec. 22, 1931 UNITED STATES ANTON GBAMBERQ' OFFRANKFORT-ON-THE-MAIN, GERMANY, ASSIGNOR 1'0 I. G. IBENINDUS'IBIEAKTIENGESELLSGHAFT,

A. CORPORATION OF GERMANY ACID-PROOF CEMIEN'IING COMPOSITIONS ANDPROCESS OF PREPARING THE SAME No Drawing. Application filed November 28,1927, Serial No. 236,388, and in Germany December 1, 1926.

The resent invention relates to acid-proof cementing compositions andprocess of preparing the same.

Hitherto iron vessels have been rovided with acid-proof liningspreferably y coveringthe inside of the vessels with acid-proof stones,small porcelain slabs or similar material, the adhesion of the stones,etc., to the Walls of the vessels and the tightness of the joints beingprocured by using a cement prepared by means of water-glass. However thewater-glass cements hitherto used were unsatisfactory because thethermal conductivity of the cementing compositions and that of the metalof which the vessel is made differ very much. Owing to the insuflicientthermal conductivity of the cement any variations of temperature, asthey naturally occur, for instance when the vessels are heated, willcause the metal and the cement to expand in a different degree so thatthe hardened cementing mass becomes fissured, articularly at the jointsof the vessel whereby the lining is very quickly destroyed.

I have now found that it is possible to impart to theacid-proof'cementingand other lining-masses a onductivit nearer to thatof the metal vessel, by using as solid constituents of the cementingcompositions, for instance, cement powder and pulverized alloys ofsilicon, the structure of which contams prlmary crystals either of RrgjiliQQQ or of a. solid solution of a ilicon. It has proved to be advaneous 0 use chiefly silicon alloys containing as alloy-component a metalwhich in combination with the other constituents of the cementing mass,posmon f excellent such as for instance water-glass, alkali, silico-{sobtained fluoride, or the like yield insoluble products, 40 forexample alloys composed of: magnesium and silicon, aluminium andsilicon, calcium and silicon or iron an si m ture Wat ru verizedsilicon-a 0y hardens much uicker than any 0 er 0 t e usua cementcompos1t1ons, even wwhtmrmfitlgagt sapphed andtms mlxture has 0 prove 0e absolutely acid-proof against anjynacid except hydro fluoric acid.

or er to obtain a well hardening composltion, the addition of about 2 to3 per cent g allo of silicon and aluminium contalning 90 per cent ofs1l1con, 1s intlmately Exams} PATENT OFFICE OF FRANKFORT-ON-THE-MAIN,GERMANY,

gree of the l onduc ivit of thegonh s1tions ependgpn their pgn tentpithe harg ening composr 1011 1s 0 ained.

so if A cement-powder, consisting of 30 grams 0 an iron-silicon-alloycontaining 90 E61 cent of SlllCOIl grams 0 so 111m s1 1cou0r1 e 7! and910 grams of uartz ow er 1s 1n 1ma e y q ,1 L mixed with 400 grams 0 waerlass. Thus, a self-hardening composmed.

Instead of an iron-silicon alloy containing 90 per cent, there may alsobe used one of a lower content, such as for instance one contai ing ercent of silicon. 7

A cement-pow er, consisting of 800 grams of an iron-silicgn-alloycontaining g5 per cent of s1 16011: 4 0 grams 0 c a 0? er an grams 0 soium silico-fluorlde 1s 111E1- mately mixed w1 grams 0 wa erlass. Thus, aself-hardening compositlon 0% excelent thermal conductivity is obtained.

A cement-powder, consisting of 1000 g ms of a silicon-alloy containin%per cent of silicon 15 111 1ma e y mlxe W1 grams 85 of waterlass. Thus,a self-hardening comthermal conductivity is A cement-powder, consistingof 1000 1= ms of an and 800 parts of a. silicon-alloy composed of 85 percent of silicon and 15 per cent of iron.

2. An acid-proof cementing composition, obtainable by intimately mixingwith 400 parts of water-glass a cement-powder consisting of 800 parts ofa silicon-alloy composed of 85 per cent of silicon and 15 per cent ofiron, 150 parts of clay-powder and 50 parts of sodium silico-fluoride,said composition being characterized b its excellent thermalconductivity and bar ening ower.

In testimony whereof, aflix my signature.

ANTON GRAMBERG.

